Photochromism of Salicylidene Aniline

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Abstract
Photochromic properties of two crystalline forms of salicylidene aniline have been investigated, emphasizimg properties not previously evaluated. A broad band with maximum absorbance at 480 mμ is induced by near uv radiation;. 380 mμ is most effective. Occurring spontaneously, the reverse change is accelerated by visible radiation; 480 mμ is most effective. The two crystalline forms require similar energy for inducing the 480-mμ band, but differ markedly in energy for the reverse change and in the kinetics of spontaneous fading. For thin films, maximum absorbance change divided by thickness is about 0.5 μ−1. The compound resists fatigue excellently when cycled by radiation most effective for photochromic changes.